Thanks folks for the responses. I spoke with my neighbor who has an OM606. He did the delivery valve seals, which looks simple. He was telling me there's a torque procedure. Would his socket work on my OM602 for the OM606 Deliv. Valves?

Also, I've seen the locking tool.. Found one for $30-40. How does that work? You plug it into the governor, holds the timing in place I'd assume?

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k